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Sascha Fistric

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Proceedings Article | 18 April 2003 Paper

Retrieval of PAR-estimates using remote sensing data and radiation transfer models

Sascha Fistric, Gerhard Gesell, Kurt Guenther

Proceedings Volume 4882, (2003) https://doi.org/10.1117/12.462410

KEYWORDS: Clouds, Data modeling, Aerosols, Atmospheric modeling, Remote sensing, Atmospheric particles, Commercial off the shelf technology, Solar radiation models, Satellites, Solar radiation

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A new method is proposed for retrieving the photosynthetically active radiation (PAR) using remote sensing data (AVHRR) and a radiation transfer model (libRadtran). The approach applicable for clear and cloudy sky conditions takes into account atmospheric parameters affecting the radiation transfer through the atmosphere, namely, extinction by aerosols and clouds. Due to the high temporal variability of cloud distribution and cloud properties, a geostationary satellite as e.g. the future Meteosat Second Generation (MSG) with SEVIRI on board is proposed to derive inter-daily variation of cloud parameters. The upcoming SEVIRI sensor will deliver spectral information of clouds and atmosphere every 15 minutes. The spectral information content of SEVIRI is simulated by the existing polar orbiting sensor Advanced Very High Resolution Radiometer (AVHRR) on board of the NOAA satellites. Our first results are validated with ground truth data from the European Light Dosimeter Network (ELDONET). Up to 8 stations distributed over Europe are available for validation purposes. It is shown that for heterogeneous atmospheric conditions a good correlation exist between measured and estimated PAR values. Processing more AVHRR data over a longer time period and fine-adjustment of the algorithms combined with extended validation will consolidate our findings in the future.

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